
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1769
1767
1767
1770
2000-100 BCE
1771
1770
1990-96
1772
1771
1765
1772 (original); 1919 (model)
1705-1737
1766
4000-2001 BCE
1769
1936
300 BCE; 1905-1915
1770
1772
1770
30 CE
30 CE
1772
1771
1770
1767-1771
1772
1770
20-400
30-200
20-500
20-500
1769
1972-3
1990-95
1772
15/7/27
1770
15/7/27
1840-160
circa 3000 BCE
3000 BCE
circa 3000 BCE
circa 3000 BCE
circa 3000 BCE
circa 3000 BCE
circa 3000 BCE
circa 3000 BCE